Posts: 5895
From: Bristol. United Kingdom
Registered: Oct 2007
posted August 25, 2017 08:24 AM
Pathescope sales literature only shows lenses of differing focal length available for the Gem/Son. Unfortunately, there is no mention of any lenses with a larger aperture.
Posts: 1423
From: Weymouth,Dorset,England
Registered: Oct 2012
posted August 25, 2017 08:25 AM
It's not a larger aperture you need, it's a quality lens with fast glass that lets more light through. Aperture size is more relative to camera lenses.